FAILHARD _ _ _ _ _ _ _ _ _ _ _ _ switch

When the failhard switch is on, the integration operator int terminates with an error message if the integral cannot be done in closed terms. Default is off.

Use the failhard switch when you are dealing with complicated integrals and want to know immediately if REDUCE was unable to handle them. The integration operator sometimes returns a formal integration form that is more complicated than the original expression, when it is unable to complete the integration.